前几天,麦子有整理到HTML代码如何压缩降低页面的体积,同时还有很多插件有实现的办法可以将页面中多个JS代码合并和压缩,这里我也在找找网上有没有整理过的方法,尤其是无插件实现的。这里找到一个可以且实现的JS代码合并的方法,但是没有压缩功能,这里先整理过来以后有需要再修改。
//JS代码合并
add_action( 'wp_enqueue_scripts', 'merge_all_scripts', 9999 );
function merge_all_scripts()
{
global $wp_scripts;
/*
#1. Reorder the handles based on its dependency,
The result will be saved in the to_do property ($wp_scripts->to_do)
*/
$wp_scripts->all_deps($wp_scripts->queue);
$merged_file_location = get_stylesheet_directory() . DIRECTORY_SEPARATOR . 'merged-script.js';
$merged_script = '';
// Loop javascript files and save to $merged_script variable
foreach( $wp_scripts->to_do as $handle)
{
/*
Clean up url
*/
$src = strtok($wp_scripts->registered[$handle]->src, '?');
/**
#2. Combine javascript file.
*/
// If src is url http / https
if (strpos($src, 'http') !== false)
{
// Get our site url
$site_url = site_url();
/*
If we are on local server, then change url to relative path
*/
if (strpos($src, $site_url) !== false)
$js_file_path = str_replace($site_url, '', $src);
else
$js_file_path = $src;
/*
To be able to use file_get_contents function we need to remove slash
*/
$js_file_path = ltrim($js_file_path, '/');
}
else
{
$js_file_path = ltrim($src, '/');
}
// Check wether file exists then merge
if (file_exists($js_file_path))
{
// #3. Check for wp_localize_script
$localize = '';
if (@key_exists('data', $wp_scripts->registered[$handle]->extra)) {
$localize = $obj->extra['data'] . ';';
}
$merged_script .= $localize . file_get_contents($js_file_path) . ';';
}
}
// write the merged script into current theme directory
file_put_contents ( $merged_file_location , $merged_script);
// #4. Load the URL of merged file
wp_enqueue_script('merged-script', get_stylesheet_directory_uri() . '/merged-script.js');
// 5. Deregister handles
foreach( $wp_scripts->to_do as $handle )
{
wp_deregister_script($handle);
}
}
这个代码添加到 Functions.php 功能中,然后我们可以看到前端JS代码都只合并成一个 merged-script.js 这样使得JS文件数量减少,如果再能压缩就更好。这个以后再看看如何实现,实在不行就要巴拉已有的插件看看如何实现的。类似的插件还是有很多的。
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